Pokémon Power: Shock Blast

"If Lt. Surge's Electrode is damaged by your opponent's attack, flip a coin. If tails, this power does 20 damage to each Active Pokémon..."
Would the Power do 20 damage to all 4 Active Pokémon in 2-on-2 or team play?

The nature of the move is that electrode releases a burst of energy into the arena/stadium/colloseum on being hit, if it's area of effect is large enough to effect a single opponent it must therefore be large enough to effect all four as they'll be placed in close proximity to electrode, no? Appologies for chipping in as a non'pro